arduous /ärˈdū-əs/

1. Steep, difficult to climb
2. Difficult to accomplish
3. Laborious

ardˈuously adverb

• walk Spanish
• walk tall
• walk the chalk
• walk the chalkmark
• walk the hospitals
• walk the plank
• walk the streets
• walk the wards
• walk-through
• walk-throughs
• walk to heel
• walk-up
• walk-ups
• walkway
• walkways
• walk with
• Walkyrie
• walky-talkies
• walky-talky
• wall
• walla
• wallaba
• wallabas
• wallabies
• wallaby